Michael Crabtree was all over the 49ers’ practice field Tuesday for the first time since July 27, when the wide receiver sustained a calf injury on the opening session of training camp.

He ran just fine. He caught a few passes. He picked Randy Moss’ brain about the fine art of blocking.

Then, when it was over, Crabtree wondered what all the fuss was about.

“I don’t know too much about injuries, bro,” he said, when asked about his latest malady. “It’s always something different in football. I’m sure everybody goes through stuff.

“It was just my calf, and I had to stay off of it. I didn’t want anything serious to happen to it.”

Crabtree, 24, even left the door open for playing Friday in the preseason opener against the Minnesota Vikings at Candlestick Park.

“I should,” he said, reasoning that the first-string unit was scheduled to play sparingly anyway.

Playing in the exhibition would represent a personal bit of history: Crabtree has yet to play in one. Since being selected in the first round in 2009, he is 0 for 12 in his chances, having been derailed in previous years by a contract holdout, a neck injury and foot surgery.

Offensive coordinator Greg Roman, speaking before Tuesday’s practice, said that using Crabtree against Minnesota would “probably be a last-minute decision.”

“He’s working through something, and we’ll have to wait and see and evaluate it,” Roman said.

Asked whether he was frustrated about being limited in yet another training camp, Crabtree waved off the question.

“I don’t think about it like that. I think about it as football,” the former Texas Tech star said. “Whenever I can go, I’m going. If I can’t go or they won’t let me go, then I can’t be out there. … I’m listening to the training staff and coaches and what’s wise for me to do.”

Crabtree participated in team activities Tuesday, a day after taking part in individual drills for the first time in more than a week. He caught two passes during seven-on-seven drills — both on short out routes — and looked smooth in doing so.

In the 11-on-11 session that followed, Crabtree caught a slant over the middle and showed a nice burst as a he ran several yards after the catch.

“I had no problems out there practicing,” he said in his first session with beat writers since the NFC Championship game Jan. 22. “I didn’t feel like anything was holding me back or nothing like that.”

The 49ers are counting on a healthy Crabtree to boost a passing game that finished 29th in the NFL last season. The team also signed veteran receivers Moss and Mario Manningham and selected A.J. Jenkins in the first round of the draft.

Crabtree posted 72 catches for 874 yards — a solid season but nowhere near the production the 49ers expected when they took him 10th overall. He had only four touchdowns.

“Every year I think we can be better,” he said. “The goal for this year is for us to put some points up. That’s what everybody plans to do. We just got to go out and do it.”

The 49ers declined to provide details on Crabtree’s training-camp injury. The receiver was in no rush to clear up the mystery, either, saying that something just “locked” in his calf muscle.

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